<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <h1 v-show="isFlag">{{msg}}</h1>
        <ul>
            <li v-if="isFlag">{{msg}}</li>
            <li v-else>{{msg}}+else</li>
        </ul>
        <ul>
            <li v-if="a==='bb'">{{msg}}</li>
            <li v-else-if="a==='aa'">{{a}}</li>
        </ul>
    </div>
    <script src="./js/vue.js"></script>
    <script>
        var vm = new Vue({
            el: '#app',
            data: {
                isFlag: false,
                msg: "hello vue",
                a: "aa",
                b: "bb",
                c: "cc"
            },
            methods: {}
        });
    </script>
</body>

</html>